The Prime Minister told Total Politics magazine that the coalition was the best way to get things done but "if that wasn't the case then we'd have to face the new circumstances in whatever way we should."
The Deputy Prime Minister will say: "He echoed exactly what both of us have always believed: this coalition has been remarkably radical; it still has work to do; and the best way for us to serve and improve Britain is by finishing what we started.
"I am absolutely committed to this coalition lasting until 2015 - as is the Prime Minister."
Claims that it was in either or both parties' interests to "prematurely pull the plug" were wrong, he will suggest.
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The poll comes ahead of a debate in the House of Commons on Friday on a new Bill which would introduce such a system in England.
Jobs with decent pay and flexibility are "few and far between" for single parents who are the main earner and carer, said the report.
Coal's share of the power mix had fallen to 7%, while wind climbed to new highs to provide 15% of the country's electricity.